My .o_fp_xpr_cell rule set width/height: 18px on every input[type=
checkbox], which broke Bootstrap's .form-switch slider proportions
(switches need width: 2em / height: 1em). Result: PO Pending and
other boolean_toggle widgets rendered as a single grey circle with
no visible track.
Excluded .o_field_boolean_toggle from the checkbox override and added
explicit Bootstrap form-switch styling — width: 2em, height: 1.2em,
accent colour on checked state, accent-bg focus ring. Non-switch
checkboxes (Blanket SO, Block partial shipments etc.) keep the 18px
square treatment.
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